JP2011231168A - Shaping material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaping material which excels in shaping properties and shape retention and enables repeated shaping.SOLUTION: The shaping material is composed of a viscoelastic resin and has a temperature of the viscoelastic resin in the range of 80-40°C when the storage modulus G', measured with the use of a dynamic viscoelasticity measurement instrument by raising the temperature of the viscoelastic resin at a rate of temperature rise of 10°C/min from room temperature to 100°C to be maintained at this temperature for three minutes, and then allowing the temperature to cool down to room temperature, is 80,000 Pa.

Description

  The present invention relates to a modeling material. More specifically, the present invention relates to a modeling material that is excellent in modeling properties, excellent in shape retention after modeling, and can be repeatedly modeled by heating.

Conventionally, oil clay, paper clay, resin clay, etc. are known as modeling clay.
Moreover, as one of the resin clays, a composition mainly composed of two or more kinds of plasticizers having different gelation speeds from vinyl chloride paste resin so as to satisfy heat kneading time and apparent viscosity at a certain temperature. There has been proposed a vinyl chloride resin clay that can be kneaded with heat and used as a clay for handicraft materials and can be erased by heating (for example, see Patent Document 1).

Japanese Patent No. 3011410

However, although oil clay can be repeatedly modeled, it is easily deformed by an external force such as gravity, so that the shape cannot be stored for a long period of time, and since there is no transparency, there is a limitation in formability, and there is a problem that the hands get dirty.
In addition, since paper clay is not transparent, there is a limit to the formability, and there is a problem that it becomes solidified when it is sealed and becomes unusable in addition to the problem of dirty hands. In addition, the resin clay has a problem that it becomes unusable when it is sealed.
Furthermore, once these clays are solidified by heating and drying after modeling, they can be softened again and cannot be used as modeling materials. Therefore, it is impossible to correct the modeling or re-execute modeling, so if it is discarded, it must be a material loss, which is extremely uneconomical.
Furthermore, these clays do not have sufficient strength of the dough itself, and are not suitable for forming thin objects such as petals.

Further, the vinyl chloride resin clay described in Patent Document 1 can be used as clay as a handicraft material and has a feature that can be erased by heating.
However, such vinyl chloride resin clay also has the same problem as the above resin clay that once it is shaped, it cannot be deformed or the shape cannot be modified, and if it is discarded, it will result in material loss. . In addition, it is necessary to blend materials so as to satisfy a complicated relational expression between the heat-kneading time and the apparent viscosity, and it is not necessarily easy to manufacture.

  In view of such circumstances, the present invention provides a modeling material that solves the above-described problems of the prior art, is excellent in modeling and shape retention, can be repeatedly modeled, and is easy to manufacture.

The present invention includes the following inventions.
(1) A molding material comprising a viscoelastic resin, wherein the temperature of the viscoelastic resin is 80 to 40 ° C. when the storage elastic modulus G ′ measured by the following method is 80,000 Pa.
Storage modulus G ′:
Using a dynamic viscoelasticity measuring device Rheosol-G1000T (manufactured by UBM Co., Ltd.), the temperature of the viscoelastic resin was raised from room temperature to 100 ° C. at a temperature rising rate of 10 ° C./min and held for 3 minutes, and then allowed to cool. Storage elastic modulus G ′ at 80 to 40 ° C. when the temperature is lowered to room temperature.
(2) The modeling material as described in (1) above, wherein the temperature of the viscoelastic resin when the storage elastic modulus G ′ is 80,000 Pa is in the range of 45 to 70 ° C.
(3) The modeling material as described in (1) above, wherein the temperature of the viscoelastic resin when the storage elastic modulus G ′ is 80,000 Pa is in the range of 50 to 65 ° C.
(4) The modeling material according to any one of (1) to (3) above, wherein the viscoelastic resin contains a softening agent and / or a filler.
(5) The modeling material according to any one of (1) to (4), wherein the viscoelastic resin is made of polyethylene.

  Since the modeling material of the present invention is excellent in modeling properties, it can be easily modeled with bare hands, and since it has strength, thin objects such as petals can be easily molded, and after molding, it has excellent shape retention and deforms and loses its shape. There is nothing. In addition, repeated modeling is possible by heating, and therefore, correction and change of modeling are easy, and even if it fails, it can be re-modeled without being discarded, and it is economical without loss. In addition, it is possible to obtain modeling materials and modeling objects having various colors and textures from opaque to metallic and further transparent.

  When the temperature of the viscoelastic resin when the storage elastic modulus G ′ is 80,000 Pa is preferably in the range of 45 to 70 ° C., more preferably in the range of 50 to 65 ° C., modeling with better moldability and shape retention A material is obtained.

  When the viscoelastic resin contains a softening agent and / or a filler, the degree of freedom in selecting the viscoelastic resin is increased, and it is easy to adjust the formability and shape retention. Moreover, polyethylene is suitable as the viscoelastic resin.

It is a graph which shows the relationship between the storage elastic modulus G 'and temperature of the modeling material obtained by the Example and the comparative example. It is explanatory drawing which shows typically the relationship between storage elastic modulus G ', temperature, modeling property, and shape retention property.

The modeling material of the present invention is made of a viscoelastic resin, and the temperature of the viscoelastic resin when the storage elastic modulus G ′ measured by the following method is 80,000 Pa is in the range of 80 to 40 ° C. Is.
Storage modulus G ′:
Using a dynamic viscoelasticity measuring device Rheosol-G1000T (manufactured by UBM Co., Ltd.), the temperature of the viscoelastic resin was raised from room temperature to 100 ° C. at a temperature rising rate of 10 ° C./min and held for 3 minutes, and then allowed to cool. Storage elastic modulus G ′ at 80 to 40 ° C. when the temperature is lowered to room temperature. The term “cooling” means that the temperature is lowered by leaving it to stand at room temperature.

  In the present invention, modeling refers to modeling a modeling material with bare hands (hands) using plastic deformation of the modeling material, that is, kneading, twisting, stretching, thickening, or thinning. It is said that a desired shape is created by overlapping, overlapping, or joining, and the temperature at this time is called a modeling temperature. In addition, shape retention means that when a model is displayed, displayed, or placed in a certain place, the shape of the model does not change due to temperature or the like and is maintained as it is.

The modeling material of the present invention requires that the temperature of the viscoelastic resin is 40 to 80 ° C. when the storage elastic modulus G ′ (G prime) measured by the following method is 80,000 Pa.
Storage modulus G ′:
Using a dynamic viscoelasticity measuring device Rheosol-G1000T (manufactured by UBM Co., Ltd.), the temperature of the viscoelastic resin was raised from room temperature to 100 ° C. at a temperature rising rate of 10 ° C./min and held for 3 minutes, and then allowed to cool. Storage elastic modulus G ′ at 80 to 40 ° C. when the temperature is lowered to room temperature.

The modeling material of the present invention is solid at room temperature, is softened by heating, becomes a modelable state, and is solidified and maintains the modeled shape when cooled to room temperature again. In order to form with bare hands (finger), it is preferable to have plasticity at 80 ° C. or lower, and it is preferable to solidify at 40 ° C. or lower from the viewpoint of shape retention.
FIG. 2 shows the relationship between the formability, shape retention, and temperature in terms of storage elastic modulus G ′. The state in which shaping can be performed with bare hands (hands) requires that the storage elastic modulus G ′ be lower than 80,000 Pa in the temperature range of 80 to 40 ° C. That is, when the storage elastic modulus G ′ is lower than 80,000 Pa, it is soft and has a large bowl shape, which is suitable for modeling. On the other hand, when the storage elastic modulus G ′ is higher than 80,000 Pa, it becomes hard, the elongation is too small, it becomes difficult to knead, and the formability such as the joint between the materials is not well connected tends to deteriorate. Become. Further, when the temperature at which the storage elastic modulus G ′ is lower than 80,000 Pa exceeds 80 ° C., the plasticity and elongation are insufficient, and it becomes too hot to form a modeling material with bare hands (hands). It becomes.
On the other hand, from the viewpoint of shape retention of the shaped article, the storage elastic modulus G ′ needs to be higher than 80,000 Pa at 40 ° C., and the higher the value, the harder the shape retention. When the temperature at which the storage elastic modulus G ′ is 80,000 Pa is lower than 40 ° C., it tends to be deformed when exhibited or displayed at room temperature, and the shape retention property of the shaped article tends to deteriorate.

  The temperature rise time to the modeling temperature is short, and after the temperature rises, the modeling can be started in a short time, and it is easy to model with bare hands (finger) without being too hot. From the viewpoint that the shaped article is not deformed due to the temperature difference, the temperature of the viscoelastic resin when the storage elastic modulus G ′ is 80,000 Pa is preferably 45 to 70 ° C., more preferably 50 to 65 ° C.

  Examples of the viscoelastic resin that satisfies the above conditions include olefin elastomers. Polyethylene is preferable, and any of polyethylene obtained with a Ziegler-Natta catalyst and polyethylene obtained with a metallocene catalyst may be used, and these may be used together as necessary.

  Examples of commercially available polyethylenes obtained with the Ziegler-Natta catalyst include Tafmer P0080K (MFR40, specific gravity 0.87), P0180 (MFR8.1, specific gravity 0.87), and P0280 (MFR5.4, specific gravity 0. 87), the same P0480 (MFR1.8, specific gravity 0.87), the same P0880 (MFR0.4, specific gravity 0.87) (above, made by Mitsui Chemicals, Inc.), etc. Used in combination.

  Examples of commercially available polyethylene products obtained with metallocene catalysts include Engage 8137 (MFR13, specific gravity 0.86, manufactured by DuPont), 8180 (MFR0.5, specific gravity 0.86, manufactured by Dow Chemical), 8407 (MFR30, Specific gravity 0.87, manufactured by Dow Chemical), 8100 (MFR1, specific gravity 0.87, manufactured by Dow Chemical) and the like can be mentioned, and these are used alone or in combination of two or more.

  The polyethylene may be used alone as described above, but a molding material having desired modeling properties and shape retention can be obtained by combining two or more types having different MFR and density.

  In addition to the viscoelastic resin, the modeling material of the present invention further includes a softener, a filler, a lubricant, a coloring material such as an organic / inorganic pigment, a dye, a fragrance, a stabilizer, an antioxidant, an ultraviolet absorber, and an antifungal agent. Other additives such as agents can be included.

Among these additives, it is easy to adjust the formability and shape retention of the modeling material by including a softening agent, a filler, or both of them.
Although it does not restrict | limit especially as a softening agent, Mineral oil, animal and vegetable oil, or the plasticizer derived from these is suitable. Specific examples of the mineral oil include paraffinic process oil (for example, PW32 manufactured by Idemitsu Kosan), naphthenic process oil (for example, NP24 manufactured by Idemitsu Kosan), aromatic process oil, and the like. Specific animal and vegetable oils include rapeseed oil, rapeseed white oil, castor oil, cottonseed oil, linseed oil, soybean oil, sesame oil, corn oil, safflower oil, palm oil, palm oil, peanut oil, wax, rosin, pine tar, tall Oil etc. are mentioned. Examples of plasticizers derived from animal and vegetable oils include glycerin fatty acid esters, and specific examples include glycerin diacetate monolaurate, glycerin triacetate, and glycerol diacetate. These may be used alone or in combination of two or more as required. From the viewpoint of environmental adaptation, it is preferable to use biomass-derived animal or vegetable oils or softeners derived therefrom.
The blending amount of the softening agent cannot be generally defined by the hardness (or softness) of the viscoelastic resin itself, but can be usually added in an amount of about 0 to 100 parts by weight with respect to 100 parts by weight of the viscoelastic resin. Is about 0 to 40 parts by weight. If the softener exceeds 100 parts by weight, bleeding may occur.

The filler is not particularly limited, but heavy calcium carbonate, light calcium carbonate, silica, mica, glass balloon, wood powder, diatomaceous earth, magnesium oxide, titanium oxide, talc, sericite, quartz powder, montmorillonite, scallop, oyster And shellfish powder such as shijimi, eggshell powder, organic hollow particles, inorganic hollow particles, and cellulose powder. These may be used alone or in combination of two or more as required. From the viewpoint of environmental adaptability, it is preferable to use biomass-derived scallops, oysters and other shellfish powders or eggshell powders that are generated in large quantities as waste.
The blending amount of the filler cannot be generally defined by the hardness (or softness) of the viscoelastic resin itself, but usually 0 to 200 parts by weight can be added to 100 parts by weight of the viscoelastic resin, preferably 0 to 100 parts by weight. When the filler exceeds 200 parts by weight, the modeling material becomes hard, sufficient plasticity is not exhibited, and kneadability and modeling property may be deteriorated.

  The modeling material of the present invention is kneaded by adding a viscoelastic resin and, if necessary, one or more of the above additives to a kneader. Although it does not restrict | limit especially as such a kneading machine, A twin screw extruder, a Banbury mixer, a pressure kneader, a mixing roll etc. are mentioned, About 80-120 degreeC kneading | mixing temperature is preferable. After kneading, the material is allowed to cool to room temperature or cooled to obtain the modeling material of the present invention.

  The obtained modeling material is heated to about 40 ° C. or higher with hot water, a dryer, an electric kettle, etc., and preferably to 80 ° C. or higher in order to lengthen the modeling time and ensure sufficient modeling time. When heated, the moisture is wiped off, and in the same manner as ordinary clay, after shaping into a desired shape with bare hands (hands) or, if necessary, using a spatula, a mold or the like, it is cooled to room temperature. The cooling may be left indoors (cooling), or may be cooled in water, in water containing ice, or in a refrigerator.

EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited only to this Example.
The materials used in the following examples and comparative examples are shown in Table 1.

Examples 1-9, Comparative Example 1
The materials shown in Table 2 were kneaded at 120 ° C. with a pressure kneader, and then allowed to cool to room temperature (25 ° C.) to obtain a modeling material.
The obtained modeling material (viscoelastic resin or viscoelastic resin composition) is used from a room temperature to 100 ° C. at a temperature increase rate of 10 ° C./min using a dynamic viscoelasticity measuring device Rheosol-G1000T (manufactured by UBM). The temperature was raised and held for 3 minutes, and then allowed to cool to lower the temperature to room temperature, and the storage elastic modulus G ′ at 80 to 40 ° C. during this temperature lowering process was plotted. The results are shown in FIG. FIG. 2 schematically shows the relationship among the storage elastic modulus G ′, the temperature, and the formability.
The obtained modeling material was heated in hot water of 80 ° C. or higher, and the modeling material at about 80 ° C. was modeled with a finger and a spatula, and then allowed to stand indoors and cooled to room temperature.

As described above, the formability and shape retention when the obtained modeling material was used for modeling were evaluated according to the following criteria. The results are shown in Table 2.
A: The temperature rise time to the modeling temperature is short, the modeling material is not too hot, and it is easy to model with bare hands (hands), and there is a sufficient difference between the modeling temperature and room temperature, so the model is not deformed.
B: The temperature rising time to the modeling temperature is relatively short, and the modeling material is not too hot, so it is easy to model with bare hands (finger), and the modeled object is difficult to deform because there is a difference from room temperature.
C1: When the temperature rise time to the modeling temperature is short and the modeling material is not too hot, it is easy to model with bare hands (hands), but the model is deformed at high temperatures such as in summer because the difference from room temperature is relatively small There is.
C2: The temperature rise time to the modeling temperature is long, the modeling material is slightly hot, but there is no particular problem with modeling with bare hands (hands), and the model is deformed because the difference between the modeling temperature and room temperature is very large do not do.
D: The temperature rising time to the modeling temperature is very short and the modeling material is easy to model with bare hands (hands), but the modeled object is deformed in summer or the like because the difference between the modeling temperature and room temperature is small.

  As described above, the modeling material of the present invention is excellent in the modeling property and the shape retaining property, and can be repeatedly modeled, so there is no loss due to disposal and is extremely economical.

Claims (5)

A modeling material comprising a viscoelastic resin, wherein the temperature of the viscoelastic resin is 80 to 40 ° C. when the storage elastic modulus G ′ measured by the following method is 80,000 Pa.
Storage modulus G ′:
Using a dynamic viscoelasticity measuring device Rheosol-G1000T (manufactured by UBM Co., Ltd.), the temperature of the viscoelastic resin was raised from room temperature to 100 ° C. at a temperature rising rate of 10 ° C./min and held for 3 minutes, and then allowed to cool. Storage elastic modulus G ′ at 80 to 40 ° C. when the temperature is lowered to room temperature.   The modeling material according to claim 1, wherein the temperature of the viscoelastic resin when the storage elastic modulus G 'is 80,000 Pa is in the range of 45 to 70 ° C.   The modeling material according to claim 1, wherein the temperature of the viscoelastic resin when the storage elastic modulus G 'is 80,000 Pa is in the range of 50 to 65 ° C.   The modeling material according to any one of claims 1 to 3, wherein the viscoelastic resin contains a softener and / or a filler.   The modeling material according to any one of claims 1 to 4, wherein the viscoelastic resin is made of polyethylene.

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